telecommunications security (Telesec)
Telecommunication Security (Telesec) is a value-added service for fileencryption.
Telesec works with a personal smart card with which the user can electronically sign his documents or files according to the asymmetric cryptographic encryption method, the RSA method, and encrypt them with the DES algorithm.
In 1991, the development projects Telesec-Fax, for protected fax file transfer, and Telesec-Voice, for confidential telephony, were introduced in ISDN. Telesec is a trademark of Deutsche Telekom.